DE2537680C3 - Process for making a roving - Google Patents

Description

The invention relates to the production of a roving from a sliver of staple fibers and at least a filament yarn wrapping around the staple fibers according to German Patent 24 47 715. Task of the main paient was to provide a roving that can be produced without great technical effort and its structure and properties allow it to be spun into staple fiber yarns without problems Roving should be made at a high working speed.

According to the main patent, this object was achieved by wrapping an unconsolidated sliver with a total denier of 1000 to 30,000 dtex with a filament yarn that had an elongation at break of less than 50% and a denier of less than 50 dtex, with 20 to 300 Turns j would be applied per meter and where that

; Sliver when wrapping in the axial direction

Speed of over 50 meters per minute.

The object of the present invention is to provide the method for producing the rovings according to the Main patent 24 47 715 to be improved even further.

From DE-OS 16 85 902 is the production of Boucle yarns by merging a core yarn with an effect yarn with the help of a false twist spindle known Before the false twist disappears again, the brought together yarns are with wound with a connecting yarn. There is no question of roving here.

DE-OS 22 20 765 describes the production of wrapped fine yarns, in which a heavier one Fiber core is wound with a continuous thread. The false sound of the staple fibers to be wound serves them Solidification; At the rotation reversal points, the surrounding filaments should directly support the strength increase, so must have high strength. The invention, however, relates to rovings in which the winding filament must tear easily so that the subsequent production of the fine yarn is not hindered.

The CH-PS 563473 describes the warping of a Roving for fine yarn production. After that Roving is warped, this structure becomes in one

such a distance from the rollers of the drafting system wrapped with a filament that the fibers are still from the rollers remain captured while their front

The ends remain wrapped around. The citation

does not apply to the wrapping of roving,

ίο but the production of Umwindefeinarnen.

According to the invention, the production of wrapped roving should be according to claim 10 of the main patent can be further improved. This was achieved by placing the sliver between delivery cylinders and a false twist is issued.

Slivers with a staple length of 35 to 150 mm are very particularly preferred

The false twist makes the edge fibers of the sliver, which runs somewhat wide in the drafting system, special integrated and the roving becomes rounder. In addition, the sliver is placed between the delivery cylinder and winding point a better cohesion

The invention is to be explained further on the basis of the following example and the drawing.

example

From 100% polyethylene terephthalate fibers dtex 1.7 / 38 mm, a roving of the strength was made on the finnisher

6700 dtex produced The sliver was not nitled, but with 1 (one) polyester monofilament dtex 10, tensile strength 33g / dtex, elongation at break 7.5% wound around. The drawing shows schematically the test equipment used for wrapping the roving. The fiber sliver 4 supplied by the outlet cylinder pair 3 of a drafting system, consisting of staple fibers, is passed through the tube 6 rotatably mounted in the holder 5 and via the traverser 7 onto the sleeve 8 wound to form the cross-wound bobbin 9 driven by

«Ο Support roller 10. Tube 6 rotates at a defined speed, driven by pulley 11 and V-belt 12, the sliver 4 through an element 13 known from the drafting system of the carded yarn spinning machine between the outlet point A and the outlet point

A 'false wire is granted for consolidation and rounding. With tube 6, the plugged-on spool 14 is firmly connected as a carrier of the wrapping filament 2, so that filament 2 is laid around the fiber sliver 4 at the winding point W when it is withdrawn from the co-rotating spool 14 and this

5 »solidified

The balloon limiter 15 attached to the spool 14 controls the tension and trouble-free operation of the Wrap filaments 2. In the example, the sliver delivery speed was 71 meters per minute. That Wrapping filament wrapped around the fiber sliver 45 times per meter. Its tear strength was 10.9 g and the adhesive length 157 m with dtex 6809 roving count. The roving was on a ring spinning machine with drafting system for Short fibers contribute to a 220 dtex yarn

spun with the usual number of yarn breaks. Yarn strength, Elongation and evenness were normal and corresponded to the values of a normal twist Flyer spun yarn.

1 sheet of drawings

Claims (1)

Claim: Method for producing a roving from a sliver of staple fibers and at least a filament yarn wrapping around the staple fibers according to the method of the German patent 2447 715 by winding around an unconsolidated sliver with a total denier of 1000 to 30,000 dtex, preferably 2,500 to 15,000 dtex with a filament yarn that has an elongation at break smaller than 50%, preferably less than 25%, and a titer of less than 50 dtex, preferably less than 15 dtex, with 20-300 turns, preferably 30 to 100 turns, on the sliver Windings per meter are applied and the sliver is wound in an axial direction Direction has a speed of over 50, preferably over 100 meters per minute, characterized in that the sliver between delivery cylinder and winding point a false twist is issued.